$\begingroup$ok, but if the nickel gets oxidized, and then reduced, there is no net reaction, right?$\endgroup$
– Buck ThornMay 27 at 12:38

$\begingroup$yes, this is from a school assignment. I did a similar one where there was no net reaction also but I understood why. In this one I dont know why one takes precedence over the other$\endgroup$
– PedroMay 27 at 12:41

$\begingroup$are you posting the full description of the problem?$\endgroup$
– Buck ThornMay 27 at 13:01